aculeatum, Ophidium Bloch [M. E.] 1786:72 [or 261], Pl. 159 (fig. 2) [Naturgeschichte der ausländischen Fische v. 2; ref. 465] Neotype locality: Kali Brantas basin, channelled stream through drained area at Campurdarat south to Tulungagung, 8°10'S, 111°20'E, Java Timur, Java, Indonesia. Neotype: ZRC 49866. Type catalog: Paepke 1999:98 [ref. 24282]. On p. 60 of Bloch's Ichthyologie, v. 5 [ref. 21381]. Neotype designated by Kottelat & Widjanarti 2005:168 [ref. 28284]. Most references result from aculeatus that was previously recognized as one widespread species. •Valid as Macrognathus aculeatus (Bloch 1786) -- (Shrestha 1978:41 [ref. 15970], Travers 1984:144 [ref. 5147], Roberts 1986:98 [ref. 5802], Roberts 1989:180 [ref. 6439], Ataur Rahman 1989:261 [ref. 24860], Kottelat et al. 1993:167 [ref. 23448], Kottelat & Lim 1994:189 [ref. 21379], Indra 1994:426 [ref. 24015], Banik & Choudhury 1996:580 [ref. 24736], Ng & Tan 1999:364 [ref. 24159], Rafique 2000:327 [ref. 25220], Arunkumar & Tombi Singh 2000:121 [ref. 25674], Kottelat 2001:63 [ref. 25482], Choi et al. 2003:237, 557 [ref. 26218], Ataur Rahman 2003:285 [ref. 31338], Kottelat & Widjanarti 2005:168 [ref. 28284], Pethiyagoda et al. 2008:43 [ref. 30097], Britz 2010:55 [ref. 30857], Ahmed et al. 2013:287 [ref. 32872], Kottelat 2013:311 [ref. 32989], Dhanze et al. 2018:370 [ref. 37780], Ng & Tan 2020:175 [ref. 37671], Hasan et al. 2022:6035 [ref. 39888]). Current status: Valid as Macrognathus aculeatus (Bloch 1786). Mastacembelidae. Distribution: Southeast Asia: Java (Indonesia) endemic. Habitat: freshwater.